Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1994-07-11
1998-07-28
Dorvil, Richemond
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704207, 704268, G01L 302
Patent
active
057873879
ABSTRACT:
A method and system is provided for encoding and decoding of speech signals at a low bit rate. The continuous input speech is divided into voiced and unvoiced time segments of a predetermined length. The encoder of the system uses a linear predictive coding model for the unvoiced speech segments and harmonic frequencies decomposition for the voiced speech segments. Only the magnitudes of the harmonic frequencies are determined using the discrete Fourier transform of the voiced speech segments. The decoder synthesizes voiced speech segments using the magnitudes of the transmitted harmonics and estimates the phase of each harmonic from the signal in the preceding speech segments. Unvoiced speech segments are synthesized using linear prediction coding (LPC) coefficients obtained from codebook entries for the poles of the LPC coefficient polynomial. Boundary conditions between voiced and unvoiced segments are established to insure amplitude and phase continuity for improved output speech quality.
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Dorvil Richemond
Voxware, Inc.
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